Electrical welding.



T. E. MURRAY & H. R. WOODROW.

ELECTRICAL WELDING.

APPLICATION FILED Dic. Io, I9I5.

1 1 72, 30 l Patented Feb. 22, 1916.

37? Vil IL\\ WI l l UN1TED STATES APATENT OFFICE.

THOMAS E. MURRAY AND 'HARRY R. WOODROW, 0F NEW YORK, N. Y.; vSAIDWOODROW ASSIGNOR TO SAID MURRAY.

.A i j ELECTRICAL WELDTNG.

Specification of Letters Patent.

Patented Feb. 22, 1916.

Application led December 1'0, 1915. Serial No'. 66,042.,

To alli/whom it may conce/rn:

Be it known that we, THOMAS E. MURRAY and HARRY R. VVooDRow,` citizensof .the

United States, residing at New York, in they county lot New York andState f New York, have invented a certain new and use- I ful Improvementvin Electrical Welding, of

" which the following is a specification.

The invention is an electrical welding ma` chine for making lap welds,and consists in the' arrangement of the roller electrodes, constructedrespectively to make contact with the overlapping body and theoverlapped body and to move over vthe surfacesl of said bodies, which atthe same time may be subjected to mechanical pressure.

In the accompanying drawings-Figure 1 is a side elevation of our weldingmachine.

Fig. 2 i's a cross section on vthe lineof- Fig. 1. Fig. 3 is an enlargedsectional viewr of the insulated joint between frame 9 and' t on, theinsulating base 5. The lower members of toggle 3 are fast on a rockshaft which carries'a treadle 6, by means of which the toggles can bestraightened Aand the y table l raised.

arm 12, made separately, has a flange 13 at material.

. vOn base 5 is a standard 7 which has a horizontal. guidebar; 8. Asliding frame 9,

through which said bar passes, has a downwardly depending arm 10, on theinner side of which is pivoted a roller 11.l A Second its upper endwhich registers witha flange 111 on frame 9, as shown in Fig. 3. Betweenflanges 13 and 14 is a plate 15 of insulating Bolts 16, .provided withinsulating, bushings, unite anges 13 and'flll.

the axis of roller 11 being above the axis of of reference On the arml2, which is inwardly. turned,is' pivoted a roller 17, having a'iiarrowcir- Y cumferential edge'. vThe central axes of the rollers l1 and 17are not in the same plane,l

l roller 17. The two rollers 11 and 17 are the welding electrodes, andmay be connected 1n any sultable way to the usual transformer18,'supplied by generator 19.`

' The-sliding frame 9fhas on its upper side a nut- 20, through whichpasses the screw 21, supported inv insulated hangers 22. Said screw isrotated, through gearing 23, by

motor 24, supported on hanger 25.

A and Bv arethe two plates to be lapwelded together, the lower plate Bhaving a series of projections on its upper side.

The plate A laps over the plate B and covers said projections. Theroller 17 when caused to travell by screw 21', runs along the upperplate A directly over said projections. The

roller 11 bears upon the uncovered portion'` of plate B, `and'ismoved'thereon coincident'ly with roller 17. The welding current thenpasses from one roller electrode through the plates A, B to the other:roller electrode, and 'forms spot welds between the two plates at theprojections C.- .At the same time,` through vthlfytogglesand treadle thetable v is lifted so as to exert 'strong mechanicalv pressure vupon theplatesA, B. `By this construction, we are enabled to keep both elec-ltrodes on the same side of ythe plates to be united, and to obviate theuse ofan electrode supporting thelower plate. This'is of advantage i-nlap welding, and restricts the current pathbetween the electrodes -to averysmall'distancefA .Y

We' claim: r

n 1. An' electrical welding machine, comprising van insulated table uponwhich the bodies to be welded are vsuperposed, one

body'lapping over a portion of. the other body, a support' movable -inthe direction of the edge of said overlapping body and having twodepending armsy diiering in length,

,and roller electrodes carried by said arms;

one of Said electrodes bearing upon the overlapped body, and the otherupon the overlapping body. j

2. An electrical welding machine, Acom prising an insulated table uponwhich the bodies to be welded-are superposed, one body lapping over aportion of the otherbody7 a In testimony whereof We have aflixed oursupport movable in the direction of the signatures in presence of twoWitnesses.

edge of said overlapping body and'having THOMAS E. MURRAY.

tizvo depending arms differing' in length, HARRY R. WOODROW. 5 rollerelectrodes carried by said arms, and Witnesses:

means-for varying the pressure between said GERTRUDE T. PORTER,

bodies and said roller electrodes. MAY T. MCGARRY.

